com.npower.dm.core.selector.CriteriaModelSelector.java Source code

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Here is the source code for com.npower.dm.core.selector.CriteriaModelSelector.java

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/**
 * $Header: /home/master/nWave-DM-Common/src/com/npower/dm/core/selector/CriteriaModelSelector.java,v 1.1 2008/09/04 06:01:19 zhao Exp $
 * $Revision: 1.1 $
 * $Date: 2008/09/04 06:01:19 $
 *
 * ===============================================================================================
 * License, Version 1.1
 *
 * Copyright (c) 1994-2008 NPower Network Software Ltd.  All rights reserved.
 *
 * This SOURCE CODE FILE, which has been provided by NPower as part
 * of a NPower product for use ONLY by licensed users of the product,
 * includes CONFIDENTIAL and PROPRIETARY information of NPower.
 *
 * USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
 * OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
 * THE PRODUCT.
 *
 * IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD NPower, ITS RELATED
 * COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY CLAIMS
 * OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR DISTRIBUTION
 * OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES ARISING OUT OF
 * OR RESULTING FROM THE USE, MODIFICATION, OR DISTRIBUTION OF PROGRAMS
 * OR FILES CREATED FROM, BASED ON, AND/OR DERIVED FROM THIS SOURCE
 * CODE FILE.
 * ===============================================================================================
 */
package com.npower.dm.core.selector;

import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.hibernate.Criteria;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.DetachedCriteria;
import org.hibernate.criterion.Expression;

import com.npower.dm.core.Model;
import com.npower.dm.core.ModelSelector;
import com.npower.dm.hibernate.entity.ModelEntity;

/**
 * @author Zhao DongLu
 * @version $Revision: 1.1 $ $Date: 2008/09/04 06:01:19 $
 */
public class CriteriaModelSelector extends AbstractModelSelector implements ModelSelector {

    private DetachedCriteria detachedCriteria = null;

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    /**
     * 
     */
    public CriteriaModelSelector() {
        super();
        this.detachedCriteria = DetachedCriteria.forClass(ModelEntity.class);
        this.detachedCriteria.createAlias("characters", "character");
    }

    /**
     * @param criteria
     */
    public CriteriaModelSelector(Criterion criterion) {
        this();
        this.detachedCriteria.add(criterion);
    }

    /**
     * @return the criteria
     */
    public DetachedCriteria getDetachedCriteria() {
        return detachedCriteria;
    }

    /**
     * @param criteria the criteria to set
     */
    public void setDetachedCriteria(DetachedCriteria criteria) {
        this.detachedCriteria = criteria;
    }

    /**
     * Add an expression into criteria.
     * @param criterion
     * @return
     */
    public DetachedCriteria addExpression(Criterion criterion) {
        this.detachedCriteria.add(criterion);
        return this.detachedCriteria;
    }

    /* (non-Javadoc)
     * @see com.npower.dm.core.ModelSelector#getModels()
     */
    public Set<Model> getModels() {
        Set<Model> result = new LinkedHashSet<Model>();
        if (this.detachedCriteria == null) {
            return result;
        } else {
            result.addAll(
                    (List<Model>) this.detachedCriteria.getExecutableCriteria(this.getHibernateSession()).list());
            return result;
        }
    }

    /* (non-Javadoc)
     * @see com.npower.dm.core.ModelSelector#isSelected(com.npower.dm.core.Model)
     */
    public boolean isSelected(Model model) {
        Criteria criteria = this.detachedCriteria.getExecutableCriteria(this.getHibernateSession())
                .add(Expression.eq("ID", new Long(model.getID())));
        List<Model> list = criteria.list();
        return !list.isEmpty();
    }

}